人不痴狂罔少年

人不痴狂罔少年

this chinese phrase keep appearing in my mind recently... it means something like one's youth is wasted if one did not do any reckless/stupid stuff when they are young? So basically, something like live life to the fullest kinda thing...

i wonder what will be a good english translation for it so that the meaning will not be lost~ haahaa!